Derivative Liabilities and Collateral Pledged (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013	Jun. 30, 2013
Derivative [Line Items]
Gross amounts of recognized liabilities	$ 138,336,000		$ 154,280,000	$ 198,489,000
Derivative Liabilities not subject to master netting agreements	10,000,000			36,800,000
Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized liabilities	128,293,000	[1]		161,720,000	[1]
Gross amounts offset in the Statement of Condition	0			0
Net amounts of liabilities presented in the Statement of Condition	128,293,000	[1],[2]		161,720,000	[1],[2]
Derivative assets available for offset	(26,475,000)			(37,505,000)
Collateral pledged	(88,935,000)			(116,510,000)
Net amount	12,883,000			7,705,000
Interest Rate Contract [Member] | Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized liabilities	128,293,000			161,300,000
Net amounts of liabilities presented in the Statement of Condition	128,293,000			161,300,000
Forwards And Futures [Member] | Subject to Master Netting Agreements
Derivative [Line Items]
Gross amounts of recognized liabilities				500,000
Net amounts of liabilities presented in the Statement of Condition				$ 500,000

[1] 2014 is comprised entirely of interest rate derivative contracts. 2013 includes $161.3 million of interest rate derivative contracts and $.5 million of forwards and futures contracts.

[2] Included in Derivative Liabilities on the Consolidated Condensed Statements of Condition. As of June 30, 2014 and 2013, $10.0 million and $36.8 million, respectively, of derivative liabilities (primarily capital markets forward contracts) have been excluded from these tables because they are generally not subject to master netting or similar agreements.